feat(shard): admin write plane, help-page queue, and public champion board

Wire up the three uo-link sidecar surfaces that weren't integrated yet.

Champion spawns
- Ingest champ.update/champ.remove into a new shard_champs table (served from
  our own store, like online/houses); public /site/champs board with a nav link,
  live via the existing SSE feed (champ.* added to the public allowlist).

Staff write plane (admin + moderator)
- kick / ban / unban / broadcast via /admin/shard/*; actor is stamped server-side
  from the session, never the browser. Sidecar status codes mapped (403 disabled/
  protected, 404 unknown, 503/504 transient). admin.audit events are logged and
  surfaced at /admin/shard/audit.
- New admin "In-Game Ops" view (/admin/shard-ops), plus per-account Kick/Ban/Unban
  on the user-detail and character views (ShardAccountActions, self-gated to staff).

Help-page (support) queue
- Ingest page.new/updated/closed into a new shard_pages table; respond/close via
  /admin/shard/pages/*. Champ board and page queue are snapshotted from the
  sidecar's /champs and /pages on every WS (re)connect (guarded so a failed call
  never wipes local state).

Verified live end-to-end against MariaDB + the Rust sidecar + ServUO; unit tests
cover ingest routing (shardIngest.champsPages.test.js). Swagger regenerated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0114TpmrNW4wNXsHq5CR72jQ

client/src/components/GameAccounts.jsx

@@ -1,6 +1,7 @@
 import { useCallback, useEffect, useState } from 'react'
 import { Link } from 'react-router-dom'
 import { Loading, ErrorState } from './PageState.jsx'
+import ShardAccountActions from './ShardAccountActions.jsx'
 
 // Shared game-account linking + character roster, used by both the player portal
 // (/player) and the staff account page (/admin/account). `scope` is the api
@@ -107,7 +108,7 @@ function AccountRoster({ scope, account, charTo }) {
   )
 }
 
-export default function GameAccounts({ scope, charTo, readOnly = false }) {
+export default function GameAccounts({ scope, charTo, readOnly = false, moderation = false }) {
   const [accounts, setAccounts] = useState(null)
   const [error, setError] = useState('')
 
@@ -156,6 +157,7 @@ export default function GameAccounts({ scope, charTo, readOnly = false }) {
           <div className="sans" style={{ color: 'var(--accent)', fontSize: '0.7rem', letterSpacing: '0.12em', textTransform: 'uppercase', marginBottom: 12 }}>
             {a.account}
           </div>
+          {moderation && <ShardAccountActions account={a.account} style={{ marginBottom: 12 }} />}
           <AccountRoster scope={scope} account={a.account} charTo={charTo} />
         </section>
       ))}